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app/src/vendor/muuri-src/utils/isNative.js

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+/**
+ * Copyright (c) 2015-present, Haltu Oy
+ * Released under the MIT license
+ * https://github.com/haltu/muuri/blob/master/LICENSE.md
+ */
+
+import isFunction from './isFunction';
+
+var nativeCode = '[native code]';
+
+/**
+ * Check if a value (e.g. a method or constructor) is native code. Good for
+ * detecting when a polyfill is used and when not.
+ *
+ * @param {*} feat
+ * @returns {Boolean}
+ */
+export default function isNative(feat) {
+  var S = window.Symbol;
+  return !!(
+    feat &&
+    isFunction(S) &&
+    isFunction(S.toString) &&
+    S(feat).toString().indexOf(nativeCode) > -1
+  );
+}